Orion Instruments Jupiter 2xx - Manual (Page 37)

46-648 Jupiter Magnetostrictive Transmitters 37
Accuracy The maximum positive and negative % devia-
tion from the actual value over the total span.
ANSI American National Standards Institute.
CSA Canadian Standards Association Canadian, third
party agency that qualifies the safety of electrical equip-
ment.
Damping The mathematical averaging of a meter and/or
output signal to stabilize the effects of a noisy process due
to surface turbulence.
Default Values The main position of the menu structure
that displays the primary measurement values of LEVEL,
% OUTPUT, and LOOP. The transmitter returns to this
position after 5 minutes of inactivity.
DVM/DMM Digital Volt Meter/Digital Multimeter.
Electromagnetic Energy The radiation that travels
through space as electric and magnetic fields varying with
position and time. Examples in increasing frequency:
radio waves, microwave, infrared light, visible light, ultra-
violet light, x-rays, gamma waves, and cosmic waves.
EM See Electromagnetic Energy.
EMI Electromagnetic Interference Electrical noise caused
by electromagnetic fields that may affect electrical circuits,
particularly low-power electronic devices.
EN European Normal Committee guidelines in EC
countries that take precedence over local, country guide-
lines.
Ergonomic A mechanism that considers human capabil-
ity in its design or function.
Explosion-Proof Enclosure An enclosure designed to
withstand an explosion of gas or vapor within it and pre-
vent the explosion from spreading outside the enclosure.
Fault A defect or failure in a circuit. The current (mA)
value unit defaults to 3.6, 22, or Hold when a diagnostic
condition occurs.
Feedthrough A small, connecting cavity between the
main housing compartments, carrying the cable that sup-
plies the operating energy to the measurement circuitry
and returns the output value proportional to level. This
cavity is potted to maintain the environmental isolation
between the two compartments.
FM Factory Mutual American, third party agency that
qualifies the safety of electrical equipment.
FSK Frequency Shift Keying.
Ground An electrical connection to the Earth’s poten-
tial that is used as a reference for the system and electrical
safety.
Grounded A state where no electrical potential exists
between the ground (green) connection on the transmitter
and the Earth or system ground.
HART Highway Addressable Remote Transducer.
Protocol that uses the Bell 202 frequency shift keying
(FSK) method to superimpose low level frequencies
(1200/2000 Hz) on top of the standard 4–20 mA loop
to provide digital communication.
HART ID See Poll Address.
Hazardous Area An area where flammable gases or
vapors are or may be present in the air in quantities suffi-
cient to produce explosive or ignitable mixtures.
IEC International Electrotechnical Commission
Organization that sets international standards for electri-
cal devices.
Increased Safety Designs and procedures that minimize
sparks, arcs, and excessive temperatures in hazardous
areas. Defined by the IEC as Zone 1 environments (Ex e).
Interface: Electrical A boundary between two related,
electronic circuits.
Interface: Process A boundary between two or more
immiscible liquids.
Intrinsic Safety A design or installation approach that
limits the amount of energy that enters a hazardous area
to eliminate the potential of creating an ignition source.
Level The present reading of the height of material in a
vessel.
Linearity The worst case error calculated as a deviation
from a perfect straight line drawn between two calibration
points.
Loop The present reading of the 4–20 mA current out-
put.
Low Voltage Directive A European Community
requirement for electrical safety and related issues of
devices using 50-1000 VDC or 75-1500 VAC.
Magnetic Level Indicator a magnetically coupled,
liquid level indicator which isolates the process in
a sealed non-magnetic piping column. Contrasting
colored flags provide indication of level.
Magnetostrictive Utilizing the Wiedemann effect to cre-
ate a mechanical torsion or twist in a ferromagnetic wire
which occurs as a result of the interaction between an
electrical pulse on the wire and a magnetic field from the
float.
Measured Value The typical level measurement values
used to track the level of a process: Level, % Output, and
Loop.
Media The liquid material being measured by the level
transmitter.
Multidrop The ability to install, wire, or communicate
with multiple devices over one cable. Each device is given
a unique address and ID.
Glossary